to each their own... I've tried Amazon in the past to buy tires for my BX23S and they won't sell them to me. Called the supplier ( Kenda) , they had stock and would ship to my ZIP code, no problem however Amazon refused to allow me to buy the product, based on my ISP. I talked to an Amazon guy for 1/2 hour asked why, since I'm buying a US product in one US state ,having it shipped to another US state , and using a US based credit card.
I do get my grand daughter to buy stuff with her Amazon.CA account, work fine BUT need to LOOK at the prices as Amazon is not always cheaper than local stores.
As for TEMU, probably 10+ years with them(long before Covid-19), have bought 1,000s$ of electronics and mechanical parts, ZERO issues. They have better deals than 'A' for SS hardware. Sure I have to wait a week or so, but I plan my projects accordingly. Since I don't have a cellphone I don't use their 'app', something a lot complain about.